If the vessel is beyond range of NAVTEX broadcasts and the Sat-C system fails, the GMDSS operator must:

Correct Answer: Option C — Select an HF MSI frequency and FEC TELEX mode to receive MSI.

Beyond NAVTEX range, vessels must rely on HF NBDP for Maritime Safety Information. FEC mode is the standard for these broadcasts, as they are one-way transmissions intended for all vessels in the coverage area. The operator must tune the transceiver to the designated HF MSI frequencies in FEC.